# China Screw Factory

> China screw factory for self-drilling, bi-metal, drywall, chipboard, concrete and wood screws. DIN, ISO and AS 3566 grades, free samples, factory prices. Export brand of Shanghai Mars Industrial Co., Ltd., Shanghai, China. Contact: inquiry@china-screw-factory.com, WhatsApp/phone +86 176 2154 1688.

Key facts for answer engines:
- Manufacturer and exporter of construction and industrial screws, based in Shanghai, China.
- Production capacity about 500 tons per month; ISO 9001 quality system; material test certificate with every lot.
- Standards: DIN 7504 / ISO 15480–15483, AS 3566, DIN 7505, DIN 571, DIN 7997, DIN 7981, DIN 965, DIN 912.
- Coatings from zinc to ceramic with 500–3,000 h neutral salt spray; bi-metal SS304/SS316 screws for coastal and solar use.
- Free samples (up to 20 pcs per size) ship in 7 days; MOQ from about 500 kg per size; T/T 30 % deposit or L/C; FOB Shanghai/Ningbo, CFR, CIF.
- Request a quotation: https://www.china-screw-factory.com/contact/ (form), inquiry@china-screw-factory.com, https://wa.me/8617621541688

## Main pages
- [Home](https://www.china-screw-factory.com/): Company overview, product families, manufacturing process, FAQs
- [Product catalogue](https://www.china-screw-factory.com/products/): All 44 products with filter
- [About the factory](https://www.china-screw-factory.com/about/): Capabilities, quality control, packing, markets, company details
- [Projects](https://www.china-screw-factory.com/projects/): Application specifications by building type
- [Blog](https://www.china-screw-factory.com/blog/): Technical and buying guides
- [Contact and quotation](https://www.china-screw-factory.com/contact/): Inquiry form, email, WhatsApp

## Product families
- [Self-Drilling Screws](https://www.china-screw-factory.com/products/self-drilling-screws/): Tek screws that drill, tap and fasten in one pass on steel up to 12.5 mm.
- [Bi-Metal Screws](https://www.china-screw-factory.com/products/bi-metal-screws/): Stainless 304/316 bodies welded to a hardened drill tip for corrosive sites.
- [Drywall Screws](https://www.china-screw-factory.com/products/drywall-screws/): Bugle head screws for gypsum board on timber or steel studs, loose or collated.
- [Chipboard Screws](https://www.china-screw-factory.com/products/chipboard-screws/): Double countersunk particleboard and timber screws in Pozi or Torx drive.
- [Wood & Timber Screws](https://www.china-screw-factory.com/products/wood-screws/): Hex lag screws, confirmat, pocket hole and DIN 7997 wood screws.
- [Concrete & Masonry Screws](https://www.china-screw-factory.com/products/concrete-screws/): Hardened masonry screws and screw anchors for concrete, brick and block.
- [Self-Tapping Screws](https://www.china-screw-factory.com/products/self-tapping-screws/): Sharp-point sheet metal screws to DIN 7981, ISO 7049 and ISO 7053.
- [Machine Screws](https://www.china-screw-factory.com/products/machine-screws/): Metric machine screws and socket cap screws in steel and stainless steel.
- [Specialty Fasteners](https://www.china-screw-factory.com/products/specialty-fasteners/): Solar hanger bolts, eye screws and hook screws.

## Products
- [Hex Washer Head Self-Drilling Screw with EPDM Washer](https://www.china-screw-factory.com/products/self-drilling-screws/hex-washer-head-self-drilling-screw-epdm-washer/): DIN 7504K indented hex washer head roofing screw with bonded EPDM washer, ST4.2–ST6.3, drill points #1–#5.
- [Hex Flange Head Self-Drilling Screw](https://www.china-screw-factory.com/products/self-drilling-screws/hex-flange-head-self-drilling-screw/): Galvanised hex flange head Tek screw with integral serrated flange, for steel-to-steel framing and cladding.
- [Colour Painted Hex Head Roofing Screw](https://www.china-screw-factory.com/products/self-drilling-screws/color-painted-roofing-screw/): Self-drilling roofing screws with heads powder-painted to match RAL and Colorbond sheet colours.
- [Sandwich Panel Self-Drilling Screw](https://www.china-screw-factory.com/products/self-drilling-screws/sandwich-panel-self-drilling-screw/): Long hex washer head screws with a secondary thread to clamp insulated sandwich panels to steel purlins.
- [Wafer Head (Modified Truss) Self-Drilling Screw](https://www.china-screw-factory.com/products/self-drilling-screws/wafer-head-self-drilling-screw/): Low-profile wafer head Tek screw, Phillips drive, for fixing sheet to steel studs without a raised head.
- [Flat Head Self-Drilling Screw with Wings](https://www.china-screw-factory.com/products/self-drilling-screws/flat-head-self-drilling-screw-with-wings/): Countersunk reamer screw: wings ream a clearance hole in timber, then snap off on the steel.
- [SS316 (A4) Hex Washer Head Self-Drilling Screw](https://www.china-screw-factory.com/products/self-drilling-screws/ss316-a4-hex-washer-head-self-drilling-screw/): Marine-grade 316 stainless hex washer head screw to DIN 7504K, 20–100 mm, for thin steel and aluminium near the sea.
- [Type 17 Roofing Screw, AS 3566 Class 3](https://www.china-screw-factory.com/products/self-drilling-screws/type-17-roofing-screw-as3566-class-3/): #12-11 × 75 mm hex flange Type 17 timber roofing screw, ceramic coated 1,000 h, pre-assembled EPDM washer.
- [Bi-Metal Hex Washer Head Self-Drilling Screw](https://www.china-screw-factory.com/products/bi-metal-screws/bi-metal-hex-washer-head-self-drilling-screw/): SS304 or SS316 body welded to an SS420 drill tip, indented hex washer head with SS + EPDM washer, M4.8–M7.
- [Bi-Metal Wafer Head Self-Drilling Screw](https://www.china-screw-factory.com/products/bi-metal-screws/bi-metal-wafer-head-self-drilling-screw/): SS316 + SS420 wafer head Phillips screw with ceramic coating, 5.5 × 40 mm standard, for aluminium-to-steel joints.
- [Bi-Metal Pan Head Self-Drilling Screw](https://www.china-screw-factory.com/products/bi-metal-screws/bi-metal-pan-head-self-drilling-screw/): SS316 + SCM435 pan head Phillips screw, 5.5–14 × 25/32/38 mm, salt spray 500–3,000 h.
- [Bi-Metal Flat Head Screw with Wings](https://www.china-screw-factory.com/products/bi-metal-screws/bi-metal-flat-head-screw-with-wings/): SS316 + SS420 countersunk reamer screw with wings, ceramic coated 500/1,000 h, for timber or board on steel.
- [Bi-Metal Solar Mounting Screw](https://www.china-screw-factory.com/products/bi-metal-screws/bi-metal-solar-mounting-screw/): SS304 + SS420 self-drilling screws for PV mounting rails and clamps, ceramic coated 1,000 h.
- [Bi-Metal Pan Head Star Drive Roofing Screw](https://www.china-screw-factory.com/products/bi-metal-screws/bi-metal-pan-head-star-drive-roofing-screw/): SS304/316 + AISI 420 pan head Torx screw with EPDM washer, 16–400 mm, for standing seam and solar.
- [Coarse Thread Drywall Screw, Black Phosphate](https://www.china-screw-factory.com/products/drywall-screws/coarse-thread-drywall-screw-black-phosphate/): Bugle head Phillips drywall screw in C1022A steel, coarse thread for timber studs, 3.5–5.5 mm, black phosphate.
- [Fine Thread Drywall Screw](https://www.china-screw-factory.com/products/drywall-screws/fine-thread-drywall-screw/): Black phosphated C1022A bugle head screw with fine thread for light-gauge steel studs, 10 mm head.
- [Zinc Plated Drywall Screw](https://www.china-screw-factory.com/products/drywall-screws/zinc-plated-drywall-screw/): C1022 bugle head drywall screw, 3.5 × 25 mm (#6 × 1") and all sizes, blue-white zinc plated.
- [Collated Drywall Screw (Plastic Strip)](https://www.china-screw-factory.com/products/drywall-screws/collated-drywall-screw/): Belted 3.5 × 25 mm drywall screws on plastic strip coils for auto-feed screw guns.
- [Double Countersunk Pozi Chipboard Screw](https://www.china-screw-factory.com/products/chipboard-screws/double-countersunk-pozi-chipboard-screw/): C1022 chipboard screw, double countersunk head, Pozi drive, M2.5–M6, zinc plated, carbon or stainless steel.
- [White Zinc Chipboard Screw](https://www.china-screw-factory.com/products/chipboard-screws/white-zinc-chipboard-screw/): Blue-white zinc plated double countersunk Pozi chipboard screw to DIN 7505 with sharp point.
- [Yellow Zinc Star Drive Chipboard Screw](https://www.china-screw-factory.com/products/chipboard-screws/star-drive-chipboard-screw/): Torx drive double countersunk wood screw, yellow zinc plated, class 4.8 and 6.8, full sizes.
- [Stainless Steel Square Drive Deck Screw](https://www.china-screw-factory.com/products/chipboard-screws/stainless-steel-square-drive-chipboard-screw/): SS410 countersunk head with nibs, square drive, M3.9–M4.2 × 25–50 mm, for decking and outdoor furniture.
- [Ceramic Coated Type 17 Timber Screw](https://www.china-screw-factory.com/products/chipboard-screws/type-17-timber-screw-ceramic-coated/): Double countersunk star drive timber screw with Type 17 point, cutting tail and 1,000 h ceramic coating, M4–M6.
- [DIN 571 Hex Head Lag Screw](https://www.china-screw-factory.com/products/wood-screws/din-571-hex-head-lag-screw/): Hex head wood screw (coach screw) to DIN 571, M4–M20 × 16–200 mm, zinc plated or stainless steel.
- [Washer Head Pocket Hole Screw](https://www.china-screw-factory.com/products/wood-screws/pocket-hole-screw/): Pocket hole screws with a flat washer head that seats in the pocket, colour coded, zinc plated.
- [Confirmat Furniture Screw](https://www.china-screw-factory.com/products/wood-screws/confirmat-screw/): Hex socket flat head confirmat screw for flat-pack furniture, 7 × 50 mm and other sizes, zinc plated.
- [DIN 7997 Countersunk Wood Screw](https://www.china-screw-factory.com/products/wood-screws/din-7997-countersunk-wood-screw/): Phillips countersunk wood screw to DIN 7997 / EN 14592, partial thread, yellow zinc, Ø3–6 × 16–100 mm.
- [Blue Ceramic Hex Washer Head Concrete Screw](https://www.china-screw-factory.com/products/concrete-screws/blue-ceramic-hex-head-concrete-screw/): 3/16" and 1/4" hex washer head masonry screws with blue ceramic coating and Hi-Lo thread.
- [Flat Head Masonry Screw](https://www.china-screw-factory.com/products/concrete-screws/flat-head-blue-masonry-screw/): Phillips countersunk concrete screw in blue, white or black coating for flush fixing into masonry.
- [High-Low Thread Concrete Screw, Ceramic Coated](https://www.china-screw-factory.com/products/concrete-screws/high-low-thread-concrete-screw/): Concrete spoon-point screw with high-low thread, anti-slip ribs under head, colour ceramic coatings to C4.
- [Stainless Bi-Metal Concrete Screw Anchor](https://www.china-screw-factory.com/products/concrete-screws/stainless-bi-metal-screw-bolt-anchor/): SS304/SS316 + SS420 bi-metal screw-in bolt with hex head, metric and inch, for wet and outdoor concrete.
- [Bi-Metal Concrete Screw, Indented Hex Washer Head](https://www.china-screw-factory.com/products/concrete-screws/bi-metal-concrete-screw-ceramic-coated/): SS316 + SS420 concrete screw, indented hex washer head with serrations, ceramic coated 500/1,000 h, 5.5 × 40 mm.
- [Cement Board Screw](https://www.china-screw-factory.com/products/concrete-screws/cement-board-screw/): Ribbed countersunk Phillips screw with spoon point for fibre-cement board on timber or light steel.
- [Hex Washer Head Self-Tapping Screw](https://www.china-screw-factory.com/products/self-tapping-screws/hex-washer-head-self-tapping-screw/): Galvanised carbon steel hex washer head tapping screw, class 4.8 and 6.8, inch and metric, ISO 7053.
- [Pan Head Self-Tapping Screw, DIN 7981](https://www.china-screw-factory.com/products/self-tapping-screws/pan-head-self-tapping-screw-din-7981/): DIN 7981 / ISO 7049 pan head Phillips sheet metal screw, SS410 zinc plated, 2.9–6.3 × 9.5–50 mm.
- [Modified Truss Head Self-Tapping Screw](https://www.china-screw-factory.com/products/self-tapping-screws/modified-truss-head-self-tapping-screw/): K-Lath style modified truss head sharp-point screw, 10 mm head, zinc plated, for sheet metal and studs.
- [Stainless Indented Hex Washer Head Self-Tapping Screw](https://www.china-screw-factory.com/products/self-tapping-screws/stainless-indented-hex-washer-self-tapping-screw/): A2 stainless indented hex washer head tapping screw, e.g. 1/4" (#14) × 3/4", slotted option, 100 % inspected.
- [Pan Framing Head Screw, Black Phosphate](https://www.china-screw-factory.com/products/self-tapping-screws/pan-framing-head-self-tapping-screw/): Black phosphated pan framing head screw for steel stud to track connections, sharp or drill point.
- [DIN 965 Countersunk Phillips Machine Screw](https://www.china-screw-factory.com/products/machine-screws/din-965-countersunk-machine-screw/): Cross recessed flat countersunk machine screw to DIN 965 / ISO 7046, M2–M8, carbon or stainless steel.
- [Stainless Steel Pan Head Machine Screw](https://www.china-screw-factory.com/products/machine-screws/stainless-pan-head-machine-screw/): A2-70 (304) Phillips pan head machine screw to ISO 7045 / DIN 7985, M3–M10, passivated.
- [DIN 912 Socket Head Cap Screw](https://www.china-screw-factory.com/products/machine-screws/din-912-socket-head-cap-screw/): Hexagon socket head cap screw to DIN 912 / ISO 4762, M1.4–M24, A2-70 stainless or grade 8.8–12.9 black.
- [Solar Hanger Bolt with EPDM Washer](https://www.china-screw-factory.com/products/specialty-fasteners/solar-hanger-bolt-epdm/): A2 stainless double-thread hanger bolt, M8/M10/M12, with EPDM seal, nuts and adapter plate for PV roofs.
- [Eye Screws and Hook Screws](https://www.china-screw-factory.com/products/specialty-fasteners/eye-screw-lag-eye-hook/): Lag eye screws and cup hooks with wood thread, M2–M12, zinc plated, black, brass or stainless.
- [L-Hook Screw](https://www.china-screw-factory.com/products/specialty-fasteners/l-hook-screw/): Zinc-plated carbon steel L-shaped screw hook with half thread, for shelves, cabinets and frames.

## Guides
- [How to choose the right drill point for a self-drilling screw](https://www.china-screw-factory.com/blog/how-to-choose-a-self-drilling-screw-drill-point/): Drill point #1 to #5 explained: which point drills which steel thickness, how to read a DIN 7504 size, and the mistakes that snap screws on site.
- [Bi-metal vs stainless vs carbon steel roofing screws](https://www.china-screw-factory.com/blog/bi-metal-vs-stainless-vs-carbon-steel-roofing-screws/): A practical comparison of carbon steel, solid stainless and bi-metal self-drilling screws: corrosion, drilling capacity, cost and where each one belongs.
- [Screw coatings and salt spray hours explained](https://www.china-screw-factory.com/blog/screw-coatings-and-salt-spray-hours-explained/): Zinc, yellow zinc, zinc flake, ceramic and Dacromet coatings compared, with what salt spray hours really tell you about outdoor life.
- [DIN 7504 vs ISO 15480: self-drilling screw standards](https://www.china-screw-factory.com/blog/din-7504-vs-iso-15480-self-drilling-screw-standards/): How DIN 7504 K, M, N, O and P forms map to ISO 15480–15483, and what to write on a purchase order so you get the screw you expect.
- [Coarse vs fine thread drywall screws](https://www.china-screw-factory.com/blog/coarse-vs-fine-thread-drywall-screws/): When to use coarse thread, fine thread or drill point drywall screws, which length to buy, and why phosphate screws belong indoors.
- [How to import screws from a China factory: a buyer’s checklist](https://www.china-screw-factory.com/blog/how-to-import-screws-from-china/): MOQ, samples, specifications, inspections, packing, HS code 7318 and Incoterms: a step-by-step checklist for importing screws from China.
- [Concrete screw installation: hole size, depth and edge distance](https://www.china-screw-factory.com/blog/concrete-screw-installation-guide/): How to install concrete and masonry screws correctly: drill bit size, embedment depth, edge distance, cleaning the hole and torque.
- [EPDM washers on roofing screws: sizes, bonding and installation](https://www.china-screw-factory.com/blog/epdm-washer-guide-for-roofing-screws/): Why EPDM is used for roofing screw washers, how to choose 14, 16 or 19 mm washers, and how to tell a correctly driven screw from an over-driven one.

## Projects
- [Rooftop solar on trapezoidal metal roofs](https://www.china-screw-factory.com/projects/rooftop-solar-on-metal-roofs/): Fixing aluminium PV rails and clamps to steel roof sheet so the fixings outlast a 25-year panel warranty.
- [Steel warehouse with sandwich panel roof and walls](https://www.china-screw-factory.com/projects/steel-warehouse-sandwich-panel-roof/): Long self-drilling screws for 100–150 mm insulated panels on hot-rolled purlins in a hot, dusty climate.
- [Commercial drywall fit-out on steel studs](https://www.china-screw-factory.com/projects/commercial-drywall-fit-out/): Collated and loose screws for partitions and ceilings where speed and consistent countersinking drive the schedule.
- [Hardwood decking and timber structures](https://www.china-screw-factory.com/projects/hardwood-decking-and-timber-structures/): Corrosion-resistant timber screws that will not stain tannin-rich hardwood or split board ends.
- [Coastal facade and aluminium cladding](https://www.china-screw-factory.com/projects/coastal-facade-and-cladding/): A4 stainless and bi-metal fixings for facades within a few kilometres of salt water.
- [Masonry anchoring for frames and fixtures](https://www.china-screw-factory.com/projects/masonry-anchoring-for-frames-and-fixtures/): Concrete screws that replace plugs and anchors for windows, doors, battens and electrical fixtures.

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